Question

In: Other

A closed system contains an equimolar mixture of n-pentane and isopentane. a) Suppose the system is...

A closed system contains an equimolar mixture of n-pentane and isopentane. a) Suppose the system is initially all liquid at 120°C and a high pressure, and the pressure is gradually reduced at a constant temperature. Estimate the pressures at which the first bubble of vapor forms and at which the last drop of liquid evaporates. Also calculate the liquid and vapor compositions (mole fractions) at those two conditions. b) Now suppose the system starts as a vapor at 1960 mm Hg and a high temperature, and the temperature is gradually reduced at constant pressure. Estimate the temperatures at which the first drop of liquid forms and at which the last bubble of vapor condenses. Also calculate the liquid and vapor compositions (mole fractions) at those two conditions. (use excel to solve question b.)

Solutions

Expert Solution


Related Solutions

A hydrocarbon feed consisting of a mixture of propane (20%), isobutene (30%), isopentane (20%), and n-pentane...
A hydrocarbon feed consisting of a mixture of propane (20%), isobutene (30%), isopentane (20%), and n-pentane (30%) is fractionated at a rate of 100 kg/h into a distillate that contains all the propane and 78% of the isopentane in the feed. The mole fraction of isobutane in the distillate is 0.378. The bottom stream contains all the n-pentane fed to the unit. Determine the flow rate of the bottom stream. provide a flow chart with component and mass of each...
A vessel contains a mixture of equimolar liquid benzene and liquid toluene that is in equilibrium...
A vessel contains a mixture of equimolar liquid benzene and liquid toluene that is in equilibrium with their vapors and air. The temperature of the mixture is 40 degrees celsius. The mole fraction of air in the vapor phase is .6 or 60%. What is the total pressure and the mole fraction of benzene in the vapor phase?
A closed container at 58.1˚C and 285 mm Hg contains a mixture of n-heptane and cyclohexane....
A closed container at 58.1˚C and 285 mm Hg contains a mixture of n-heptane and cyclohexane. Both liquid and vapor phases exist in equilibrium, and the vapor phase contains 32 mol % n-heptane. a) Calculate the mole fractions of the liquid phases. b) Now, the pressure in the container doubles, will the saturation pressure of n-heptane increase, decrease, or stay the same? Justify your answer
Nitrogen is bubbled through a liquid mixture that contains initially equimolar amounts of benzene (B) and...
Nitrogen is bubbled through a liquid mixture that contains initially equimolar amounts of benzene (B) and toluene (T). The system pressure is 3atm and the temperature is 80 degrees Celsius. The nitrogen flow rate is 10 standard liters per second. The gas leaving the bubbler is saturated with B and T vapors. (a) Estimate the initial rated (in mol/min) at which B and T leave the bubbler. (b) How will the mole fraction of B and T in the liquid...
Nitrogen is bubbled through a liquid mixture that contains initially equimolar amounts of benzene (B) and...
Nitrogen is bubbled through a liquid mixture that contains initially equimolar amounts of benzene (B) and toluene (T). The system pressure is 3 atm and the temperature is 80C. The nitrogen flow rate is 10.0 standard liters per second. The gas leaving the bubbler is saturated with B and T vapors. a) Estimate the initial rates (in mol/min) at which B and T leave the bubbler. b) How will the mole fractions of B and T in the liquid change...
100 moles/min of a mixture of 40 mol% n-pentane and 60 mol% n-heptane are fed through...
100 moles/min of a mixture of 40 mol% n-pentane and 60 mol% n-heptane are fed through a valve into a flash tank. The flash tank operates at 600 mmHg. A T-xy diagram is provided on the next page. (a) Determine the bubble point and dew point of the feed mixture at 600 mmHg. (b) If the flash tank is operating at 60 0C determine; a. the compositions of the streams leaving the flash tank b. the flow rate in liters/min...
#3 Consider a system that is 30 % n-Butane, 40 % n-pentane and 30 % n-hexane....
#3 Consider a system that is 30 % n-Butane, 40 % n-pentane and 30 % n-hexane. a. Estimate the bubble pressure at a temperature of 80 C. What would be the composition of the vapor formed? b. Estimate the dew pressure at 80 C. What would be the composition of the liquid formed? c. Estimate the bubble temperature at a pressure of 2 atm? What would be the composition of the vapor formed? d. If this mixture was at 100...
A steam contains 55 mol% n-pentane, 25 mol%n-hexane and 20 mole% n-heptane is to be processed...
A steam contains 55 mol% n-pentane, 25 mol%n-hexane and 20 mole% n-heptane is to be processed at 69°C. The following data are available. Data at 69°C P(pentane)vap.= 2.755 bar, P(hexane)vap.=1.021 bar and P(heptane) vap.=0.390 bar. a) What is the bubble point pressure of this mixture and vapor composition that results? b) What are the dew point of this mixture and the liquid composition that results?
A rigid and closed steel tank with a volume of 86 dm 3   contains a mixture...
A rigid and closed steel tank with a volume of 86 dm 3   contains a mixture of saturated vapor and liquid at a quality and pressure of 0.9 and 20 bar respectively. Heat is removed from the system until it reaches 147 ° C. What is the volume of the saturated liquid phase at the end state?
A mixture of propane, butane and pentane are to be separated in a distillation column. Feed=...
A mixture of propane, butane and pentane are to be separated in a distillation column. Feed= Propane - 20 wt % Butane - 50 wt% Pentane - 30wt%. Top=Propane – 93 wt% Butane - 7 wt% Pentane – 0 wt%. Bottom=Propane - ?? wt % Butane - ?? wt% Pentane - 38 wt%. The weight % values shown are compositions. The total feedrate is 5000 kg hr-1. ALL the pentane is recovered in the bottom product, (comprising 38 wt% of...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT